Incandescent lamp.



A. S. KNIGHT. INGANDESOENT LAMP.

APPLICATION FILED MAY 13, 1909 1,0593%. Patented Apr. 22, 1913.

WITNESSES: INVENTOR UNITED sTATEs PATENT orruon.

ARTHUR S. KNIGHT, OF NEWARK, NEW JERSEY, ASSIGNOR TO WESTINGHOUSE LAMP COMPANY, A CORPORATION OF PEN NSYLVANI IN OANDESCEN-T LAMP.

Specification of Letters Patent.-

, Patented Apr. 22,1913.

Application filed May 13, 1909. Serial No. 495,788.

lamps, and particularly to lamps havingvery long, fine filaments, such as filaments composed of, or containing, tungsten.

The object of the invention is to provide a lamp the construction of which shall be such that the lamp maybe more expeditiously and economically manufactured than other lamps heretofore provided, and in which the filament shall be so mounted that it may withstand severe shocks and vibration without breakage. One of the modifications of the lamp is also adapted to give the gregtest candle power when viewed end on.

Owing to the difliculty that has heretofore existed of producing tungsten and similar very fine filaments in considerable lengths, or m lengths suflicient for the complete circuit within a lamp, the filaments have been made into short lengths of U or hair-pin shape and have been mounted by fusing their extremities together and to supporting members therefor. The filaments have thus been rigidly supported at intervals of their lengths, with the result that they have been particularly subject to breakage at or near these points of support, upon the occurrence of shocks and vibration. Moreover, the fusing of the filament very often weakens it. Means have now been provided, however, by others than myself, for producing filaments continuously and in great lengths, and, instead of cutting the filament into short I lengths and bending them into U or hair- 7 alone it is secured by fusing or otherwise,

pin shape, I propose to make the entire filament within the lamp continuous between the terminal-supporting members, to which the filaments being loosely supported at intermediate points.

. Figure 1 of the accompanying drawing is a perspective view of the internal parts of a,

amp constructed in accordance with the present invention. Fig. 2 represents a modificatlon of a portion of the structure of Fig.

of which'the following is a 1 and Fig. 3 is a perspective view of a modification of the lamp of- Fig. 1.

In Fig. 1, an arbor 1 that is mounted upon a stem 2 is providedwith two sets of Wire or other suitable projecting supporting members 3, the free ends of which are hookshaped two of the supporting members 4: and 5 being extended downwardly through the stem 2 and forming terminals for thelamp. A filament 6 extends, in zigzag form, between the terminal-supporting members 4 and 5,.to which it is fusedor otherwise suitably secured, and it is looped about and supported upon the hook-shaped ex tremities of the supporting members 3. The filament may be simply bent or looped but once around the supporting members 3, as shown in Fig. 1, or it may be looped twice around the supports to form nearly two convolutions surrounding the same, as shown in Fig. 2.

A modification of the lamp is illustrated in Fig. 3, in which'a short arbor 7 having a flattened end carries two sets of hooked supporting members 8 that posite sides thereof and upon which. the filament is mounted as in Fig. 1 and arranged in a plane which is substantially perpendicular to the axis of the stem of the lamp. With this arrangement, the lamp is adapted to give the greatest luminosity when viewed from its end or toward the endv of the arbor.

As the filament in the present lamp is rigidly secured only at its extremities to the supporting members therefor, and merely passes over or loosely surrounds the re maining supporting members, it is specially adapted to sustain severe shocks and vibration without breakage, and, since it is continuous between the terminal-supporting members, it is more readily applied to the mounting than the short pieces of filament of U or hair-pin shape, which have been heretofore commonly employed.

I claim as my invention:

1. An incandescent lamp comprising an arbor, a plurality of hook supporting members projecting therefrom and arranged in groups upon opposite sides thereof, and a filament extending in zig-zag form between the supporting members in a plane substantially normal to the axis of the arbor.

2. An incandescent lamp comprising an project from oparbor, a plurality of supporting members carried thereby, and a single filament extending between the supporting members in a lanethat is substantlally normal to the single reversely -bent filament occupying a ing-in wires, and a filament that is coiled planethat is substantially normal to the axis of the lamp.

5. An incandescent lamp comprising a re versely bent filament the legs of which are substantially normal to the axis of the lamp.

7 6. An incandescent lamp comprising leading-in wires, a filament support, and a fila-, ment carried by the leading-1n wires and the support and having its extremities coiled around the leading-1n wires.

7. An incandescent lamp comprising lead around the leading-in wires. 8. An incandescent lamp comprising'lead- 1ng-1n wires, and a filament extending continuously in zig-zag formation between the leading-in wire sand having its ends coiled around the leading-in wires. V

9. An incandescent lamp comprisingl a filament support," and a reversely bent ment [carried by the leading-in wires and the support and having its ends coiled around the leading-in wires.

10. incandescent lagnp comprising an arbor, leading-in wires extending therethrough, a filament support carried by the arbor, and a filament extending between the leading-in wires and the said support in a plane that is substantially normal to the axis of the arbor.

11. An incandescent lamp-compris' an arbor, a plurality of supporting mem ers carried thereby, and a single, continuous, reversely bent filament located-substantially wholly in a plane substantially normal to the axis of the lamp.

In testimony whereof, I have hereuntosubscribed my nanie this 30th day of April,

- ARTHUR S. KNIGHT. Witnesses:

H. 1). MADDEN, -J'. F. DONOVAN. 

